After about an hour or so (and half of that time I was struggling getting the top bolt of the catalytic converter off), I finally got the test pipe on. Took her out for a quick spin...I do NOT notice any difference in power between the stock hollowed out catalytic converter and the test pipe. I guess gas disturbances in the cat is not significant as claimed. Noise level is the same. The stock ITR muffler muffs quite well. Anyways, I'm too lazy to put the hollowed cat back on. May be another day biggrin

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It's powered by GASOLINE damnit!!!